smdb1.c
上传用户:xu_441
上传日期:2007-01-04
资源大小:1640k
文件大小:10k
- /*
- ** Copyright (c) 1999 Sendmail, Inc. and its suppliers.
- ** All rights reserved.
- **
- ** By using this file, you agree to the terms and conditions set
- ** forth in the LICENSE file which can be found at the top level of
- ** the sendmail distribution.
- */
- #ifndef lint
- static char id[] = "@(#)$Id: smdb1.c,v 8.40 1999/11/23 08:42:53 gshapiro Exp $";
- #endif /* ! lint */
- #include <unistd.h>
- #include <stdlib.h>
- #include <fcntl.h>
- #include <sendmail/sendmail.h>
- #include <libsmdb/smdb.h>
- #if (DB_VERSION_MAJOR == 1)
- # define SMDB1_FILE_EXTENSION "db"
- struct smdb_db1_struct
- {
- DB *smdb1_db;
- int smdb1_lock_fd;
- bool smdb1_cursor_in_use;
- };
- typedef struct smdb_db1_struct SMDB_DB1_DATABASE;
- struct smdb_db1_cursor
- {
- SMDB_DB1_DATABASE *db;
- };
- typedef struct smdb_db1_cursor SMDB_DB1_CURSOR;
- /*
- ** SMDB_TYPE_TO_DB1_TYPE -- Translates smdb database type to db1 type.
- **
- ** Parameters:
- ** type -- The type to translate.
- **
- ** Returns:
- ** The DB1 type that corresponsds to the passed in SMDB type.
- ** Returns -1 if there is no equivalent type.
- **
- */
- DBTYPE
- smdb_type_to_db1_type(type)
- SMDB_DBTYPE type;
- {
- if (type == SMDB_TYPE_DEFAULT)
- return DB_HASH;
- if (strncmp(type, SMDB_TYPE_HASH, SMDB_TYPE_HASH_LEN) == 0)
- return DB_HASH;
- if (strncmp(type, SMDB_TYPE_BTREE, SMDB_TYPE_BTREE_LEN) == 0)
- return DB_BTREE;
- /* Should never get here thanks to test in smdb_db_open() */
- return DB_HASH;
- }
- /*
- ** SMDB_PUT_FLAGS_TO_DB1_FLAGS -- Translates smdb put flags to db1 put flags.
- **
- ** Parameters:
- ** flags -- The flags to translate.
- **
- ** Returns:
- ** The db1 flags that are equivalent to the smdb flags.
- **
- ** Notes:
- ** Any invalid flags are ignored.
- **
- */
- u_int
- smdb_put_flags_to_db1_flags(flags)
- SMDB_FLAG flags;
- {
- int return_flags;
- return_flags = 0;
- if (bitset(SMDBF_NO_OVERWRITE, flags))
- return_flags |= R_NOOVERWRITE;
- return return_flags;
- }
- /*
- ** SMDB_CURSOR_GET_FLAGS_TO_SMDB1
- **
- ** Parameters:
- ** flags -- The flags to translate.
- **
- ** Returns:
- ** The db1 flags that are equivalent to the smdb flags.
- **
- ** Notes:
- ** Returns -1 if we don't support the flag.
- **
- */
- int
- smdb_cursor_get_flags_to_smdb1(flags)
- SMDB_FLAG flags;
- {
- switch(flags)
- {
- case SMDB_CURSOR_GET_FIRST:
- return R_FIRST;
- case SMDB_CURSOR_GET_LAST:
- return R_LAST;
- case SMDB_CURSOR_GET_NEXT:
- return R_NEXT;
- default:
- return -1;
- }
- }
- SMDB_DB1_DATABASE *
- smdb1_malloc_database()
- {
- SMDB_DB1_DATABASE *db1;
- db1 = (SMDB_DB1_DATABASE *) malloc(sizeof(SMDB_DB1_DATABASE));
- if (db1 != NULL)
- {
- db1->smdb1_lock_fd = -1;
- db1->smdb1_cursor_in_use = FALSE;
- }
- return db1;
- }
- /*
- ** The rest of these function correspond to the interface laid out
- ** in smdb.h.
- */
- int
- smdb1_close(database)
- SMDB_DATABASE *database;
- {
- SMDB_DB1_DATABASE *db1 = (SMDB_DB1_DATABASE *) database->smdb_impl;
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- if (db1->smdb1_lock_fd != -1)
- (void) close(db1->smdb1_lock_fd);
- free(db1);
- database->smdb_impl = NULL;
- return db->close(db);
- }
- int
- smdb1_del(database, key, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- u_int flags;
- {
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- return db->del(db, &key->db, flags);
- }
- int
- smdb1_fd(database, fd)
- SMDB_DATABASE *database;
- int *fd;
- {
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- *fd = db->fd(db);
- if (*fd == -1)
- return errno;
- return SMDBE_OK;
- }
- int
- smdb1_get(database, key, data, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- SMDB_DBENT *data;
- u_int flags;
- {
- int result;
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- result = db->get(db, &key->db, &data->db, flags);
- if (result != 0)
- {
- if (result == 1)
- return SMDBE_NOT_FOUND;
- return errno;
- }
- return SMDBE_OK;
- }
- int
- smdb1_put(database, key, data, flags)
- SMDB_DATABASE *database;
- SMDB_DBENT *key;
- SMDB_DBENT *data;
- u_int flags;
- {
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- return db->put(db, &key->db, &data->db,
- smdb_put_flags_to_db1_flags(flags));
- }
- int
- smdb1_set_owner(database, uid, gid)
- SMDB_DATABASE *database;
- uid_t uid;
- gid_t gid;
- {
- # if HASFCHOWN
- int fd;
- int result;
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- fd = db->fd(db);
- if (fd == -1)
- return errno;
- result = fchown(fd, uid, gid);
- if (result < 0)
- return errno;
- # endif /* HASFCHOWN */
- return SMDBE_OK;
- }
- int
- smdb1_sync(database, flags)
- SMDB_DATABASE *database;
- u_int flags;
- {
- DB *db = ((SMDB_DB1_DATABASE *) database->smdb_impl)->smdb1_db;
- return db->sync(db, flags);
- }
- int
- smdb1_cursor_close(cursor)
- SMDB_CURSOR *cursor;
- {
- SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
- SMDB_DB1_DATABASE *db1 = db1_cursor->db;
- if (!db1->smdb1_cursor_in_use)
- return SMDBE_NOT_A_VALID_CURSOR;
- db1->smdb1_cursor_in_use = FALSE;
- free(cursor);
- return SMDBE_OK;
- }
- int
- smdb1_cursor_del(cursor, flags)
- SMDB_CURSOR *cursor;
- u_int flags;
- {
- SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
- SMDB_DB1_DATABASE *db1 = db1_cursor->db;
- DB *db = db1->smdb1_db;
- return db->del(db, NULL, R_CURSOR);
- }
- int
- smdb1_cursor_get(cursor, key, value, flags)
- SMDB_CURSOR *cursor;
- SMDB_DBENT *key;
- SMDB_DBENT *value;
- SMDB_FLAG flags;
- {
- int db1_flags;
- int result;
- SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
- SMDB_DB1_DATABASE *db1 = db1_cursor->db;
- DB *db = db1->smdb1_db;
- db1_flags = smdb_cursor_get_flags_to_smdb1(flags);
- result = db->seq(db, &key->db, &value->db, db1_flags);
- if (result == -1)
- return errno;
- if (result == 1)
- return SMDBE_LAST_ENTRY;
- return SMDBE_OK;
- }
- int
- smdb1_cursor_put(cursor, key, value, flags)
- SMDB_CURSOR *cursor;
- SMDB_DBENT *key;
- SMDB_DBENT *value;
- SMDB_FLAG flags;
- {
- SMDB_DB1_CURSOR *db1_cursor = (SMDB_DB1_CURSOR *) cursor->smdbc_impl;
- SMDB_DB1_DATABASE *db1 = db1_cursor->db;
- DB *db = db1->smdb1_db;
- return db->put(db, &key->db, &value->db, R_CURSOR);
- }
- int
- smdb1_cursor(database, cursor, flags)
- SMDB_DATABASE *database;
- SMDB_CURSOR **cursor;
- u_int flags;
- {
- SMDB_DB1_DATABASE *db1 = (SMDB_DB1_DATABASE *) database->smdb_impl;
- SMDB_CURSOR *cur;
- SMDB_DB1_CURSOR *db1_cursor;
- if (db1->smdb1_cursor_in_use)
- return SMDBE_ONLY_SUPPORTS_ONE_CURSOR;
- db1->smdb1_cursor_in_use = TRUE;
- db1_cursor = (SMDB_DB1_CURSOR *) malloc(sizeof(SMDB_DB1_CURSOR));
- db1_cursor->db = db1;
- cur = (SMDB_CURSOR *) malloc(sizeof(SMDB_CURSOR));
- if (cur == NULL)
- return SMDBE_MALLOC;
- cur->smdbc_impl = db1_cursor;
- cur->smdbc_close = smdb1_cursor_close;
- cur->smdbc_del = smdb1_cursor_del;
- cur->smdbc_get = smdb1_cursor_get;
- cur->smdbc_put = smdb1_cursor_put;
- *cursor = cur;
- return SMDBE_OK;
- }
- /*
- ** SMDB_DB_OPEN -- Opens a db1 database.
- **
- ** Parameters:
- ** database -- An unallocated database pointer to a pointer.
- ** db_name -- The name of the database without extension.
- ** mode -- File permisions on the database if created.
- ** mode_mask -- Mode bits that must match on an existing database.
- ** sff -- Flags for safefile.
- ** type -- The type of database to open
- ** See smdb_type_to_db1_type for valid types.
- ** user_info -- Information on the user to use for file
- ** permissions.
- ** db_params --
- ** An SMDB_DBPARAMS struct including params. These
- ** are processed according to the type of the
- ** database. Currently supported params (only for
- ** HASH type) are:
- ** num_elements
- ** cache_size
- **
- ** Returns:
- ** SMDBE_OK -- Success, otherwise errno.
- */
- int
- smdb_db_open(database, db_name, mode, mode_mask, sff, type, user_info,
- db_params)
- SMDB_DATABASE **database;
- char *db_name;
- int mode;
- int mode_mask;
- int sff;
- SMDB_DBTYPE type;
- SMDB_USER_INFO *user_info;
- SMDB_DBPARAMS *db_params;
- {
- int db_fd;
- int lock_fd;
- int result;
- void *params;
- SMDB_DATABASE *smdb_db;
- SMDB_DB1_DATABASE *db1;
- DB *db;
- HASHINFO hash_info;
- BTREEINFO btree_info;
- DBTYPE db_type;
- struct stat stat_info;
- char db_file_name[SMDB_MAX_NAME_LEN];
- if (type == NULL ||
- (strncmp(SMDB_TYPE_HASH, type, SMDB_TYPE_HASH_LEN) != 0 &&
- strncmp(SMDB_TYPE_BTREE, type, SMDB_TYPE_BTREE_LEN) != 0))
- return SMDBE_UNKNOWN_DB_TYPE;
- result = smdb_add_extension(db_file_name, SMDB_MAX_NAME_LEN,
- db_name, SMDB1_FILE_EXTENSION);
- if (result != SMDBE_OK)
- return result;
- result = smdb_setup_file(db_name, SMDB1_FILE_EXTENSION, mode_mask,
- sff, user_info, &stat_info);
- if (result != SMDBE_OK)
- return result;
- lock_fd = -1;
- # if O_EXLOCK
- mode |= O_EXLOCK;
- # else /* O_EXLOCK */
- result = smdb_lock_file(&lock_fd, db_name, mode, sff,
- SMDB1_FILE_EXTENSION);
- if (result != SMDBE_OK)
- return result;
- # endif /* O_EXLOCK */
- *database = NULL;
- smdb_db = smdb_malloc_database();
- db1 = smdb1_malloc_database();
- if (smdb_db == NULL || db1 == NULL)
- return SMDBE_MALLOC;
- db1->smdb1_lock_fd = lock_fd;
- params = NULL;
- if (db_params != NULL &&
- (strncmp(SMDB_TYPE_HASH, type, SMDB_TYPE_HASH_LEN) == 0))
- {
- memset(&hash_info, ' ', sizeof hash_info);
- hash_info.nelem = db_params->smdbp_num_elements;
- hash_info.cachesize = db_params->smdbp_cache_size;
- params = &hash_info;
- }
- if (db_params != NULL &&
- (strncmp(SMDB_TYPE_BTREE, type, SMDB_TYPE_BTREE_LEN) == 0))
- {
- memset(&btree_info, ' ', sizeof btree_info);
- btree_info.cachesize = db_params->smdbp_cache_size;
- if (db_params->smdbp_allow_dup)
- btree_info.flags |= R_DUP;
- params = &btree_info;
- }
- db_type = smdb_type_to_db1_type(type);
- db = dbopen(db_file_name, mode, 0644, db_type, params);
- if (db != NULL)
- {
- db_fd = db->fd(db);
- result = smdb_filechanged(db_name, SMDB1_FILE_EXTENSION, db_fd,
- &stat_info);
- }
- else
- {
- if (errno == 0)
- result = SMDBE_BAD_OPEN;
- else
- result = errno;
- }
- if (result == SMDBE_OK)
- {
- /* Everything is ok. Setup driver */
- db1->smdb1_db = db;
- smdb_db->smdb_close = smdb1_close;
- smdb_db->smdb_del = smdb1_del;
- smdb_db->smdb_fd = smdb1_fd;
- smdb_db->smdb_get = smdb1_get;
- smdb_db->smdb_put = smdb1_put;
- smdb_db->smdb_set_owner = smdb1_set_owner;
- smdb_db->smdb_sync = smdb1_sync;
- smdb_db->smdb_cursor = smdb1_cursor;
- smdb_db->smdb_impl = db1;
- *database = smdb_db;
- return SMDBE_OK;
- }
- if (db != NULL)
- (void) db->close(db);
- /* Error opening database */
- (void) smdb_unlock_file(db1->smdb1_lock_fd);
- free(db1);
- smdb_free_database(smdb_db);
- return result;
- }
- #endif /* (DB_VERSION_MAJOR == 1) */